膜孔参数及表面活性剂对微孔曝气器充氧性能的影响研究
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摘要
污水处理厂曝气设备的性能及水质条件是影响曝气充氧性能的重要因素,比较了清水及不同表面活性剂浓度下橡胶膜曝气器的曝气充氧性能,以标准氧传质效率(SOTE)为评价指标,得出了不同工况及膜孔参数下曝气充氧性能的变化规律。结果表明:在清水条件下,SOTE随着通气量、膜孔间距、膜孔孔径的增大而降低;表面活性剂条件下的SOTE(αSOTE)随着表面活性剂浓度的增大而降低;修正系数(α,αSOTE与SOTE的比值)随着膜孔孔径的增大而增大,膜孔孔径越小,表面活性剂对橡胶膜曝气器充氧性能的抑制作用越大。
Aeration equipment performance and water quality conditions of wastewater treatment plants were important factors that could affect the performance of oxygen transfer.This paper studied the performance of different membrane bubble diffusers under clean water and different surfactant concentrations.Using oxygen transfer efficiency as evaluation index,the results showed that the standard oxygen transfer efficiency(SOTE)increased with the increasing of air flow rate,decreased with the increasing of the pore distance,decreased with the increasing of the membrane pore size and decreased with the increasing concentrations of surfactant.The value ofα(αSOTE(surfactant)/SOTE(clean water))increased with the increasing of the membrane pore size and surfactant depressed the aeration oxygenation performance of membrane bubble diffuser with the increasing of the membrane pore size.
Aeration equipment performance and water quality conditions of wastewater treatment plants were important factors that could affect the performance of oxygen transfer.This paper studied the performance of different membrane bubble diffusers under clean water and different surfactant concentrations.Using oxygen transfer efficiency as evaluation index,the results showed that the standard oxygen transfer efficiency(SOTE)increased with the increasing of air flow rate,decreased with the increasing of the pore distance,decreased with the increasing of the membrane pore size and decreased with the increasing concentrations of surfactant.The value ofα(αSOTE(surfactant)/SOTE(clean water))increased with the increasing of the membrane pore size and surfactant depressed the aeration oxygenation performance of membrane bubble diffuser with the increasing of the membrane pore size.
引文
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[14]CHERN J M,CHOU Shunren,SHANG Chousheng.Effects of impurities on oxygen transfer rates in diffused aeration systems[J].Water Research,2001,35(13):3041-3048.
[15]刘春,张磊,杨景亮,等.微气泡曝气中氧传质特性研究[J].环境工程学报,2010,4(3):585-589.
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[18]ROSSO D,STENSTROM M K.Alpha factors in full-scale wastewater aeration systems[J].Proceedings of the Water Environment Federation,2006,54(10):4853-4863.
[2]ROSSO D,STENSTROM M,LARSON L.Aeration of largescale municipal wastewater treatment plants:state of the art[J].Water Science&Technology,2008,57(7):973-978.
[3]范海涛,王洪臣,齐鲁,等.污泥浓度对微孔曝气氧传质过程的影响[J].环境工程学报,2012,6(12):4305-4309.
[4]BISCHOF F,HFKEN M,DURST F.Design and construction of aeration systems for optimum operation of large wastewater treatment plants[J].Water Science&Technology,1996,33(12):189-198.
[5]刘鹏,郑祥,王博,等.曝气系统中水质条件对氧传质影响的研究进展[J].工业水处理,2014,34(9):10-14.
[6]庄健,王洪臣,刘国华,等.曝气密度对曝气系统充氧性能的影响研究[J].环境污染与防治,2014,36(7):50-54.
[7]CHEN Xulu,LIU Guohua,FAN Haitao,et al.Effects of surfactant contamination on oxygen mass transfer in fine bubble aeration process[J].Korean Journal of Chemical Engineering,2013,30(9):1741-1746.
[8]陈旭露,王洪臣,齐鲁,等.阴离子表面活性剂对微孔曝气氧传质过程影响的研究[J].环境科学学报,2013,33(2):395-400.
[9]庄健,王洪臣,齐鲁,等.孔径对微孔曝气充氧性能的影响[J].环境工程学报,2014,8(5):1723-1726.
[10]于江忠,单继宏,孙毅,等.微孔曝气器膜片最优开孔数的数值模拟[J].机械制造,2014,52(1):10-12.
[11]ROSSO D,LARSON L,STENSTROM M.Surfactant effects on alpha factors in full-scale wastewater aeration systems[J].Water Science&Technology,2006,54(10):143-153.
[12]DAVIES J T.Turbulent phenomena[M].New York:Academic Press,1972.
[13]罗涛,王洪臣,齐鲁,等.总溶解性固体及表面活性剂对微孔曝气氧传质过程影响的中试研究[J].环境科学学报,2012,32(9):2066-2070.
[14]CHERN J M,CHOU Shunren,SHANG Chousheng.Effects of impurities on oxygen transfer rates in diffused aeration systems[J].Water Research,2001,35(13):3041-3048.
[15]刘春,张磊,杨景亮,等.微气泡曝气中氧传质特性研究[J].环境工程学报,2010,4(3):585-589.
[16]WHITMAN W G.The two film theory of gas absorption[J].International Journal of Heat and Mass Transfer,1962,5(5):429-433.
[17]ASCE/EWRI 2-06,Measurement of oxygen transfer in clean water[S].
[18]ROSSO D,STENSTROM M K.Alpha factors in full-scale wastewater aeration systems[J].Proceedings of the Water Environment Federation,2006,54(10):4853-4863.